Unhandled exception at() fonctionner une app utilisant le Mapnik)

[MEDSALHI]

Salut
je suis un débutant dans la programmation C++
et je veut fonctionner une application C++ appelant d'une librairie open source Mapnik
(pas mieux que le demo/C++ dans le mapnik0_7)
tout va bien mais elle se bloque au niveau de ce code
....
Map m(800,600);
m.set_background(color_factory::from_string("white "));
......
...
m.insert_style("provinces",provpoly_style);

et il me génere le message suivant

Unhandled exception at 0xbff00000 in MonPremier.exe: 0xC0000005: Access violation reading location 0xbff00000.

d'ou provient ce message ? comment le résoudre?

merci pour vos contrubitions

[Elysia]

This is an english discussion board. As thus, you are expected to post your replies in english, if you want help.

Furthermore, from your post, it isn't obvious what the error is. You cannot just throw some random code on us and expect us to tell you what's wrong.
Let's this this again. Post the smallest possible snippet of code that demonstrates the problem and post in english.

[EVOEx]

This is an english forum, please post your question in english.

But there's nothing wrong with the code you copied, not as far as I know at least (I don't know the library you are using). What does provpoly_style point to? Is it a pointer?